Users can also specify body material, selecting from stainless or carbon steels, and exotic materials such as titanium, Monel or Hastelloy C276. This wide choice allow process instrumentation designers to minimise weight, and optimise protection for a wide range of aggressive media and environments. These materials offer proven properties to combat the corrosive effects of sea water and various aggressive chemicals for example, providing solutions for offshore and onshore petrochemical industries, chemical processes, power generators, and pulp and paper plants among others. Parker additionally offers a NACE MR-0 1 -75 variant for ‘sour gas’ applications. Offering a pressure rating of 6,000 PSI (413 bar), Parker’s new U16 valve is ideally suited for demanding applications in areas involving high temperature and pressure media, such as saturated and superheated steam in power generation plants; rapid temperature cycling, a common characteristic of numerous chemical processes; and vibration, as might be encountered on a drilling platform or pumping station. Protection measures for critical service applications come in several forms. A robust forged body and heavy-duty union bonnet nut protect against vibration and the effects of expansion or contraction forces during rapid temperature changes. The valve’s packing is sited below the power threads, isolating the thread and lubricants from the media. The packing nut incorporates a dust seal, to safeguard the stem threads from external contamination. U16’s stem swivel occurs above the packing, eliminating stem tip entrapment areas, while the non-rotating lower stem extends working life and aids repeatable seating performance. Further safety measures include a stem tip design which ‘back seats’ the lower stem when in the open position to guard against blow-out, and provides a further barrier against leakage. Optionally, the valve can be ordered with a blunt stem tip to combat’wire-draw’ erosion which can occur with two-phase flow in steam service applications. In its standard form, the valve stem is made from 17-4 PH stainless steel and comes with PTFE packing. Alternatively, users can specify either a 17-4 PH or 316 stainless steel lower stem, with Grafoil packing for ultra high temperature working - allowing the valve to operate from -65 to +1200°F/-53 to +648°C. U 1 6 can be specified with an in-line or angle body, both of which offer the upper body length for mounting on panels, and may be fitted with a wide range of end connections to suit different applications and plant standards. Tube connection options include singleferrule CPI and twin ferrule A-lok in metric or imperial sizes, female and male NPT pipe threads, ultraseal , or socket weld in sizes from 112 to 1 inch. The product is the newest member of a family of union bonnet valves, allowing Parker to provide options for fluid instrumentation applications involving tubing of up to 1 inch/25mm diameter.